It’s a bad day to be a yen bull or a dollar-yen bear. Last time the yen was that low most of you weren’t even born.

💴 Yen Hits a Four-Decade Low

  • The Japanese yen slid past ¥162 per US dollar on Tuesday, touching its weakest level since December 1986. That's nearly 40 years ago — back when CDs were cutting-edge technology and most traders hadn't even discovered charts.
  • The climbed as high as ¥162.40, extending the yen's losses to more than 3% this year. The move reflects growing doubts that Japan can keep inflation under control while other major central banks lean toward tighter monetary policy.
  • Japan's Chief Cabinet Secretary, Minoru Kihara, wasted little time issuing another warning this morning, saying authorities "stand ready to take action whenever necessary." Translation: intervention remains firmly on the table.

🏦 Why the Yen Keeps Falling

  • Traders increasingly believe the Bank of Japan is falling behind the curve. That's market speak for reacting too slowly to rising inflation, allowing price pressures (and the weaker currency) to stick around longer than investors would like.
  • The BoJ recently , its highest level since 1995. Even so, markets expect only one more modest quarter-point increase by January, while the Federal Reserve is still seen as potentially hiking rates once or twice to around 4%.
  • Higher US rates make dollar-denominated assets more attractive than Japanese ones. That encourages investors to buy dollars and sell yen, widening the interest-rate gap that has become one of the biggest drivers of dollar-yen.

📈 Tic-Tac, Clock’s Tickin’

  • Japan's booming stock market is adding another twist. The Nikkei's record-breaking rally this year has attracted overseas investors into AI and semiconductor stocks, many of whom hedge their currency exposure by selling yen, creating additional downward pressure.
  • Officials have already spent tens of billions of dollars to support the currency. Intervention means the government enters the foreign exchange market and buys yen directly in an attempt to slow or reverse the slide.
  • Whether intervention comes down to one question: speed. Japanese authorities have often tolerated a weak yen, but rapid one-way moves tend to grab their attention. And, what’s interesting, is that Japan has around $1.3 trillion of firepower to fight the stronger dollar.